If you guys are going to build the cathode broskie follower only, there won't be voltage amplification so there's a chance the signal will be very low. The first stage in the unbalancer is to voltage amplify the DAC output.

I built both but I upgraded to the unbalancer because of lack of amplification. Both sound great.

Having started working with a kit, not an assembled unit, after the experiment was working .There was a lot of spare parts

Just remove the 4 resisters that pass the I2S bus to the DAC and link the I2S bus from the USB convertor
I used the resisters that were to fit in that location.(I don't really think the the resister are needed, links would do)
Keep the lenghts of the links short

I2S is the link I hoped to use on interface with this DAC. Problem seems to be that I2S links need to be short, which is physically impossible if you don't put the DAC inside the DAC or DVD or CD player. That certainly sort of limits using it with different players.

If you have any suggestion on how to solve that, adding I2S output interfaces on players that would allow longer cables, like a buffer or something, that should be great.